AP63356/AP63357

Document number: DS41949 Rev. 3 - 2

3 of 29

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August 2019

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AP63356/AP63357

Pin Descriptions

Pin Name

Pin Number

Function

VIN

1

Power Input. VIN supplies the power to the IC as well as the step-down converter power MOSFETs. Drive VIN with a

3.8V to 32V power source. Bypass VIN to GND with a suitably large capacitor to eliminate noise due to the switching

of the IC. See Input Capacitor section for more details.

EN

2

Enable Input. EN is a digital input that turns the regulator on or off. Drive EN high to turn on the regulator and low to

turn it off. Connect to VIN or leave floating for automatic startup. The EN has a precision threshold of 1.18V for

programing the UVLO. See Enable section for more details.

FB

3

Feedback sensing terminal for the output voltage. Connect this pin to the resistive divider of the output.

See Setting the Output Voltage section for more details.

COMP

4

Compensation. Connect the COMP pin to GND to use internal loop compensation. Connect an external RC network

to the COMP pin to adjust the loop response. See External Loop Compensation Design section for more details.

PG

5

Power-Good Pin. Open-drain power-good output with internal 5M

 pull-up resistor that is pulled to GND when the

output voltage is out of its regulation limits or during soft-start.

BST

6

High-Side Gate Drive Boost Input. BST supplies the drive for the high-side N-Channel power MOSFET. A 100nF

capacitor is recommended from BST to SW to power the high-side driver.

NC

7

No Connect. There is no internal connection to this pin. The pin can be tied to any other pin or left floating.

GND

8

Power Ground.

SW

9

Power Switching Output. SW is the switching node that supplies power to the output. Connect the output LC filter

from SW to the output load.